36 lines
826 B
Go
36 lines
826 B
Go
// Copyright 2011 The Graphics-Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package graphics
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import (
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"code.google.com/p/graphics-go/graphics/interp"
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"errors"
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"image"
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"image/draw"
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)
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// RotateOptions are the rotation parameters.
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// Angle is the angle, in radians, to rotate the image clockwise.
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type RotateOptions struct {
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Angle float64
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}
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// Rotate produces a rotated version of src, drawn onto dst.
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func Rotate(dst draw.Image, src image.Image, opt *RotateOptions) error {
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if dst == nil {
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return errors.New("graphics: dst is nil")
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}
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if src == nil {
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return errors.New("graphics: src is nil")
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}
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angle := 0.0
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if opt != nil {
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angle = opt.Angle
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}
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return I.Rotate(angle).TransformCenter(dst, src, interp.Bilinear)
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}
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